Laser induced fluorescence and its structural origin of the 1ω absorptive fluorophosphate glasses wi

来源 :第七届中国功能玻璃学术研讨会暨新型光电子材料国际论坛 | 被引量 : 0次 | 上传用户:nannoha2
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  To explore innovative optical optics that can efficiently separate the third harmonic frequency (3ω) laser light from the fundamental frequency (1ω) and the second harmonic frequency (2ω) laser light in inertial confinement fusion (ICF) laser systems has been an urgent quest for the development of high-powered, high energy lasers.In this paper, a new type of fluorophosphate glasses doped with high content 1ω absorptive ions and prepared under reducing atmosphere.The glasses have specific high absorption towards 1 ω laser light and good performance in resistance to laser induced damage at 351 nm.The zero probability laser induced damage threshold (LIDT) of fluorophosphate glass is 12.5 J/cm2 at 351nm and 36.6 J/cm2 at 1053nm under 8ns pulse laser irradiations.Under irradiations of 351 nm pulsed laser, eye visible laser-induced fluorescence (LIF) centered at about 600 nm was observed simultaneously.The intemal transmittance spectra, absorption of Fe2+ in the glass were characterized to assess its 3ω transmitting and 1ω absorbing ability as potential use of new color separation optics.The contrast tests on UV absorption and optical bandgap, X-ray photoelectron spectra (XPS), NMR, Raman and Electron spin resonance (ESR) spectra were carried out, through which the nature of structural defects in laser modified fluorophosphate glass was evaluated.Finally, a point defects related laser induced fluorescence mechanism was proposed for the fluorophosphate glasses.With use of these fluorophosphate glasses as new color separation optics, it will provide innovative approach for color phase separation and help to further increase the laser output energy of the ICF laser systems.
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